Sandpapering and rubbing machine



Jan. 13, 1931.

E. L. TORRISON SAND PAPERING AND RUBBING MACHINE Filed July 23. 192$ 2 Sheets-Sheet 1 INVEN TOR.

fflW/l/LD A. TOIPE/J'OW Jan. 13, 1931. Rls 1,788,603

SAND PAPERING AND RUBBING MACHINE Filed. July 23, 1928 2 SheetsSheet 2 INVENTOR. .EDWAED 1.. roe/a/ a/v mg BY C ATTORNEYS.

I Patented Jan. 13 ,"l931 N A t snnnrnrnnmeinivn meme MACHIN Applicatioh filed 'J'uIy 23, 1928. 'Seria1 :No. 4

The invention forming, the subject matter of this application relateslto sandpapering and rubbing machines; and particularly to the type of sand paperingor rubbing1nachines which areoperated by compressed air or other fiuid'unde'r pressure. 7 r The pim'ary object :of the invention is th provision of a sand papering or rubbinginachine in which a sandpapering or rubbing i barrel is reclprocated, and in which means a are provided 'forcontrolling the fiowof fluid under pressure to act. on oppositeends of the barrehthe means being so cons'tructedas to prevent violent vibration of thedevice during the reciprocation ofthe sand paper or other finishing plate moved by saidbarrel. Another object of-the invention is the pro- 1 vision of a sand papering-or rubbing machine in which a Valve is operated for admitting fluidunder pressure so as to act; alternately on-the opposite heads of a barrel slidable on a stationary piston, and which valve is slid able in the piston and is so partitioned and so actuated by the opposite heads of the barrel as to direct the fluid under pressure toward'the head of the barrel which is closest to a piston end. v A still further object of the invention is the provision of a cylindricahsliding valve in'a stationary'piston, upon which piston is slidable abarrelcarrying asand paperingor rubbing deviceythc" cylindrical valve being alternately actuated by the opposite" heads ofithe barrel at the ends of their respective strokes so asto enable said valve to direct the flow of the fluid under pressureagainst the head-of the barrel closest to an endoi the piston; the heads being adapted tOre'ceive the adjacent'endof the cylindrical valve in sucha manneras to provide an aircushion', thereby preventing the violent vibrationgof the valve orof the barrel.

With the above mentioned objects other objects in view,- the inventionyconsists of parts hereinafter. described; illustrated in the accompanying drawing, and set forth in theclaims hereto appended, it beingunder stood that various changes inthe form'ypro: pcrtion, size, and minor. details or construc- EiiwAnn L; 'ro'nmson, orsan'frnnnoisco, oALIroRNI'in. Ass'IG von o '3 WAYNlE I PHILLIPS, YOFJOAKLAND, CALIFORNIA i lresortedto without departingfrom the spiri L'Figuref) is alongitudinal section of the in the'vnovel construction and combination:

tioni Within'the scope of the'claim's'imay it or without sacrificing any of the advan-' tages of the invention.., i v

In the drawings a I V Figure 1 is a side elevation of the sand papering and'rubbing machine;

Figure 2 is an end view ofthe same; Figureil is a longitudinalsection-of the machine; i l Figured is a sectional view of the'sand papering or rubbing machine, the section being taken on the 'line 44 of Figuret3;

sand papering-orrubbing machine, showing a the barrel t'hereofat the end of its stroke opposite to the position shown; in Figure 3, and also showinglthe-position ofthe valve after the same is actuated bysaid barrel;

Figure 16 is a fragmentary sectional View 170, of the machine showing the barrel in -aposi tion when the fiuid'under pressure is permit ted toexert its force to the full surface of thebarrel head; and f 1 P Figure 7 is a sectional view taken on the line 7"''7 of Figure 6, showing the valve travel' 'limiting means for the cylindrical valver" Referring to the accompanying drawings,

wherein similar reference charactersfdesso 7 ignate similar partsthruout, the various figures described above" adequately. illustrate 'myinvention, andthe following detaileddescripticn is commensurate with the above mentioned dr'awings'in enabling an artisan V to construct and assemble the constituentq parts of the same. 1

Encarrymg out my IHVBHtiO'II, I make use I of a'piston' designated by the numeral 6. 4 A

concentric bore 7 extendsithruout the piston 9Q 6, in said bore is shdably d1sposed acyhndrical SllCllIlQVitlVQ-Bn"The piston s held stationary by the-grasping-of'ahandle, de noted in its entiretyzby the numeral.j9,,the I handle being secured to the centralportion ofQG;

the piston by means of'abolt llithe threaded Y Y i l of which is fixedly secured intoa c'or-- respondingthreaded hole 12 in the piston 6. The head 'ofsthe bolt 11' is countersunk into thehandle 9 as shown inFigurei-L sopasto I ton 6.

render the surface of the handle smooth. Thru the handle and thru the bolt 11 is an intake passage 13 in continuation of which is the intake opening 14 extending thru the piston 6 to the bore 7 7 An atmospheric out- A cylindrical barrel 17 is slidable upon the piston 6. The cylmdricalbarrel' 17 is longer than the piston 6 so as to allow the reciprocation of the former upon the latter. 7 In order 'to prevent the relative movement of the handle 9 around "the barrel l7,-arms 18 e1;-

tend'fromthe opposite sides of each end of the handle 9. The arms 18 are converging toward the barrel 1'? and the ends thereor" are arcuate so as to conform to the outside periphery of the barrel- 17, at the same time bearing thereagainst when there is a tendency to turn the handle around the barrel.

It is to be understoood that although a particular typefof handle is shown, other styles of handles may be used for the same purpose. For instance, a single open U- shaped handle may be secured to the central portion. of the piston and above the intake opening thereof, upon which the usual trigger control valve arrangement may be employed. In the present device,.the flow of the fluid under pressure is, controlled by a valve on the conduit leading to the intake passage 13. V i

The barrel 17 is terminated at one end thereof by a head 19 and at the other end thereof by a similar barrel head 21. The passage of the cylindrical sliding valve 8 is divided into two compartments by means of a partition 22 disposed substantially at the center of the valve 8. At one side of the partition 22 is a valve inlet opening 23 andon the other side of the partition is another valvev inlet opening 24. Equally spaced from the respective valve inlet openings are valve outlet 0 enin s 26 one between each valve-intake opening andthe respective end of the valve 8. It is to be noted that the ends of the cylindrical valve protrude beyondt-he' "ends of the piston 6.

. The movement of the valve 8 in the pis- 7 ton bore 7 is limited by means of pins 27 threadedly secured into corresponding holes I c at the opposite sides of the intake opening '14. The pins 27 cooperate wlth corresponding slots 28 in the periphery of the cylindrical sliding valve 8. The slots 28 are so dimensioned as to limit the movement of the sliding cylindrical valve 8 in such a manner as'tostop said movement when either the valve inlet opening 23 or the valve inlet I opening 24 is in alignment with the. intake opening 14:. In Figure 3, the valve 8 is shown'in such a position that the valve travel in the direction of the barrel head 21 reached its end and any further travel thereof-is prevented by the pins 2?. In this position, the valve inlet opening 23 is in alignment with theintake opening 1 1. 7

It is to benoted that the outlet openings 26 of the valve 8 are so spaced from the valve inlet openings that when the valve inlet opening 23 is in alignment with theintake opening 14, then the valve outlet opening 26 on the otl er side of the partition 22 is in alignment with the atmospheric outlet opening 16; and

lar grooves corresponding to the cylindrical valve 8 so as to receive the ends of the valve 8 therein. Y

On the barrel 17 are provided downwardly extending bosses 29, one at each end of the barrel, upon which bosses is secured a plate 81 by means of. screws 32. The plate 31 may be of any suitable material used for certain types of finishing. The plate may carry a sand paper block or a sheet of sand paper for sand papering the surface or may carry a rubbing or polishing member or other suitable finishing materials.

The device operates as follows: Theair is admitted thru the intake passage 13 and intake opening 14 and when the valve and the barrel are in the position shown in Figure 3, then the airenters into the valve 8 thru the valve inlet opening 28. The air pressure is then exerted both upon the partition 22 and upon the portion of the head 19 within the annular groove 20. The action of the fluid under pressure cannot move the valve 8 because its movement in the direction of the head 21 is limited by the engagement of the ends ofthe' slots 28 with the pins 27. Thus, the pressure exerted on'the head 19 moves the head 19- away from the respective end of the pistonlbythereby moving the barrel 17 In order to allow the free movement of the barrel 17 unobstructed by the securing bolt 11, a slot 33is provided in the barrel 17, which slot is slidable around the bolt 11; The slot 33 is of suflicient length to allow the full stroke of the barrel 1? as hereinafter described. During the movement of the barrel 17 when the barrel head 19 moves away from the end of the piston 6, the barrel head 21 moves toward the other end of the p ston 6,

and the annular groove-20 in'the head 19 Y 1 versing the movement thereof in adirection relative positionjust after theannu1argro0ve V20 slid oil-the end of the valve 8. :Now, the ofullpower of the co'mpressed'airis applied upon-the inside surface of, the head 19, and

the barrel-17 is moved toward the end of its first stroke. At the end ofthis stroke,- the groove 20 of the head 21 slides upon-the adj acent head of the valve 8. The air-in the an nular groove 20 is compressed by the end of ing 14,-and the valve outlet opening 26 on the opposite side ofthe partition 22 is in alignment with the corresponding 1 atmospheric opening 16.

v "Now; the'compressed air passes thruthe valve inlet opening Qlihtothevalve 8 so as to be directed thereby against the head .21, re-

' away from the adjacent end of the piston 6.

This movement now brings the other head-19 toward the corresponding. end of the piston 6 until the end oflitsstr-oke, at which time the annular groove 20 in the head 19 engages the end of the valve -8 and moves the same in the direction of the head 21', thereby bringing ag'ainthe valve inlet opening 23 in align ment with the inlet opening 14 and'also bringing the other outlet opening in alignment with the corresponding atmospheric'outlet opening16. 7v 7 It is to be noted that the air cushion in the annular grooves 20 also results :in the spacing of the inside face of the heads 19 and 21 from the respective ends ofthe piston 6, at ,theend of their respective strokes. Thus, it isevident that all knocking impacts at the ends of the strokes are efi ectively obviated.

It will be recognized that a particularly 6 simple deviceis provided in which the .use of a plurality of pistons is eliminatedand in which the barrel is slidable on a piston and the fullforce of the compressed fluid or air is applied to the respective head of the barrel toresult in its motion to the: end of itsstroke.

7 It willalso' be recognized that at the endoi' each stroke, the valve is positively operated so as to direct the air toward the opposite headrthereby reversing the movement of the barrel 17 I The air cushions between the ends of the valve 8 and the inside ends of the annular groove 20and the air cushions termed between the inside surface of the heads 19 or 21 and the adjacent end face of the piston 6 effectively prevent the violent vibrationsand knocking of the tool.

"The latter aircushion is formed n account of the closing of the'valve end in the groove ing element 20, beforeallithe air is exhausted from-be tween the heads 19 .or'215 and the adjacent end of thepiston 6, thus forming a chamber at the, said endofthe piston fromwhichthe 1 air is not.exhausted.-

I It is merelyjnecessary-to hold the tool the handle "9, place the finishingsurface of the plate 31'n'pon 1 he object tobe sand paper ed, polished, rubbed, or otherwise finished,

and then by admitting compressed air thru the passages 13:,the barrel 17 is continuously reciproc ated upon the/piston 6, effectively reciprocating the f rubbing surface; thereby "fiuishingthe object desired. The device is a unitarycharacter and does notlrequire any careful setting up, and thereforeit is readily adaptable to i be operated bytthe labor ordinarily availablel v liicl'a'im: Y 1' 1. In a device of the character described, a supporting member having'an inlet opening an d,: exhaust opening therein; a reciproca- 1 ory member slidable on the supporting mem her, the ends of said reciprocatory member enclosing chambers at the respfective ends of i the supporting memberg'a valve slidable in the supporting memberin-operative relation to said inlet and outlet openings,said'valve being adapted, to be actuatedeby the said reciprocatory member'so as to" alternately. di-

recta fluid under vpressure from the saidinlet opening into oneof said chambers andto connect the other chamber with one of the exliaiistppenings, thereby causing the map rocationiof said reciprocatory member 3 and a surface finishing elementcarried by said reciprocatory member. i i

2. In a 'deviceoi' thecharacter described, asupporting member having a longitudinal passage therethr'inand having an inletopein ing and outlet opening connecting to said passage; areciprocatory member slidable on I the supporting member, thefornier being longer than the latter; a valve"slldable in the said passage, said valve beingso actuated alternately by the opposite ends of the I'QCTPIQ? catory members as to direct a fluid under pressureagainstithe end of the reciprocatory member lW'hiBh is-closest to an end of the supper-ling member, and to allow the exreciprocatory member; and asurface finishmember, "a

3'. In a device otthe character describ'edpa oiston: means for su or fino' the piston. m x

said piston havingan inlet and outlet opening therein; barrel slidable on the piston, the barrel being longer than the piston, the

ends of the barrel enclosing'a chamberat each 2. endofthe piston; a valve slidable inthe pis carried said recirrocfiwry ton and being adapted to be so'actuated by the'eudsot the barrel as toalternateiy direct a'fluid under pressure from saiclinletopem I V ing to one of thechiembers, and allowthe exhaust of the fluid from the other chamber; and a surface finishing element carried by the barrel.

the same, said valve having aninlet and an outlet opening at each side of the partition, so disposed that an inlet opening on one side of the partition and an outlet opening on the opposite side of the partition are simultaneously brought in operative relation to the respective openings ot'the piston; the ends of the barrel being adapted to alternately actuate said valve so as to cause the same to direct a fluid under pressure from the piston inlet opening against the barrel end closest to an end of the piston; and tar/exhaust thefluid from the chamber at the other end of the piston; and a'surface finishing element carried by the barrel.

5. In a device of the character described, a piston adapted to be held in stationary position, said piston having a longitudinal passage therethru and having an inlet and exhaust opening therein, communicating with the said passage; a barrel being longer than the piston so as to enclose a chamber at each end of the piston, said barrel being slidable on the piston; a tubular valve slidable in the passage; a partition in thevalveicr dividing the same, said valve having an lnlet and an outlet opening at each side of the partition, so disposed that an inlet opening on one side of the partition and an outlet opening on the opposite side of the partition are simultaneously brought in operative relation to the respective openings of the piston; the

ends of the barrel being adapted to alternately actuate said valve so as to cause the same to direct a fluid under pressure from the piston inlet opening against the barrel end closest to an end of the piston, and to exhaust the fluid from the chamber at the other end of the piston; theends of the tubular valve extending beyond the ends of the piston; the said barrel ends al ernately abutting against the respective ends at the end of each stroke of the barrel; and a surface finishing element carried by the barrel.

6. In a device of the character described, a piston adapted to be held in stationary position, said piston having a longitudinal passage therethru and having an inlet and exhaust opening therein, communicating with the said passage; a barrel beinglonger than the piston so as to enclose a chamber at each end of the piston, said barrel being slidable on the piston; a tubular valve slidable in the pas sage; a partition in the valve for dividing the same, said valve 'having'aninlet-and an outlet opening at each side of the partition, so disposed that an inlet opening on one side of the partition and an outlet opening on the opposite side of the partition aresimultaneously brought in operative relation to the respective openings of the piston; the ends of the barrel being adapted to alternately actuate said valve so as to cause thesame to direct a fluidunder pressure from the piston .inlet opening against the barrel end closest to an end of the. pistomandto exhaust the 'fluid from the chamber at the other end of the piston; theends oi' the tubular valveextendingbcyond the ends of they piston; the said barrel ends alternately abuttingagainst the respective valve ends at the end of each stroke of the 'bar1'el;n1eans for limiting the valvetravel so as to cause the stopping of the valve in coasting position with the piston inlet and exhaust openings, and a surface finishingele- :ient carried by the barrel.

7. In a device of: the character described, a piston adapted to be held in stationary position, said piston having a longitudinal passage therethru and having an inlet and exhaust opening therein, communicating with the said passage; a-ibarrel' being longerthan the piston so as toenclose a chamber at each end of the piston, said barrel being slidable on the piston; a tubular valve slidable in the passage; a partition in the valve for dividing the same, said valve having an inlet and an outlet opening at each side of the partition, so disposed that an inlet opening on one side of the partition and an outlet opening on the opposite side of the partition are simultaneously brought in operative relation to the respective openings of the piston; the ends or" the barrel being adapted to alternately actuate said valve so as to cause .thesame to direct a fluid under pressure from the piston inlet openin against the barrel end closest to an end of-the piston, and to exhaust the fluid from the chamber at the other end of the piston; the ends of thetubular valve extending beyond the ends of the piston; the said barrel ends alternately abutting against the respective valve ends at the'end of each stroke of the barrel; means for limiting the valve travel so as tocause the stopping of the valve in coacting position with the piston inlet and exhaust openings, each barrel end having an annular groove therein for receiving the corresponding end of the tubular valve, so as to form an air'cushion at said end, and a surface finishing element carried by the barrel.

8. In a device of the character described, a supporting member, a reciprocating casing surrounding and slidable on said supporting member, a valve for alternately directing a fluid under pressure against the ends of the casing, so as to cause the reciprocation there- 7 of, said valve being actuated by said recip 7 j rocating casing and a surface finishingelement secured to, the casing.

1 i 9. In a deviceof the character described, a

supporting member having inlet and outlet openings therein-for conducting a'fluid under ressure a reci, rocatin casin surroundin l) and slidable on, said supporting member, a valve disposed in operative relation to said inlet and outleto'penings, said *valve being actuated by the said reciprocating casing, for

alternately directingi'the fluid .under pres? sure against theends of the reciprocating cas I ,ing and for allowing the exhaust of fluid from theencl of the reciprocating casing not under s fluid pressure and a surface finishing element secured to the casing.

10. A rubbing device comprising a piston, agreciprocating, casing surrounding the piston, a valve foralternately directing a fluid V H 7 under; pressure againstthe ends of the casing,

' said valve'being actuated by said casing, shock absorbers at the ends of the casing and I directingafluid' under pressure to the ends of the casingfiand avfinishingelement aflixed to 30 a finishing element aflixed to the casing. I 11.A rubbing machine comprising a stationary pistonya casing surrounding the piston, a Valve Within thepiston for alternately the casing; I A c a In testimony whereof I aflixmy signature. 

